Thermic probe system with metal element - has glass enclosure containing vacuum or gas pressure compensated for use in extreme temp. ranges

摘要

A thermic probe comprises a wire (a) fabricated of an appropriate metal which is located in a sealed enclosure (b). The enclosure may be vacuous or filled with inert gas. The wire (a) may be fabricated from the metallic ribbon of a printed circuit board or by a vapourised deposit on a support when the enclosure (b) is vacuous. The enclosure is suitably pressurised or depressurised in dependence upon its intended application to low or high temp. ranges so as to prevent implosion or explosion of the probe in use. The enclosure (b) itself is constructed from glass or metal or ceramics or quartz.